Struct BitmapMmapRegion

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pub struct BitmapMmapRegion { /* private fields */ }
Expand description

BitmapMmapRegion implements a bitmap tha can be replaced at runtime. The main use case is to support live migration on vhost-user backends (see VHOST_USER_PROTOCOL_F_LOG_SHMFD and VHOST_USER_SET_LOG_BASE in the vhost-user protocol specification). It uses a fixed memory page size of VHOST_LOG_PAGE bytes (i.e., 4096 bytes), so it converts addresses to page numbers before setting or clearing the bits.

To use this bitmap you need to define the memory as GuestMemoryMmap<BitmapMmapRegion>.

Note: This implementation uses std::sync::RwLock, the priority policy of the lock is dependent on the underlying operating system’s implementation and does not guarantee any particular policy, in systems other than linux a thread trying to acquire the lock may starve.

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impl Bitmap for BitmapMmapRegion

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fn mark_dirty(&self, offset: usize, len: usize)

Mark the memory range specified by the given offset and len as dirtied.
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fn dirty_at(&self, offset: usize) -> bool

Check whether the specified offset is marked as dirty.
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fn slice_at(&self, offset: usize) -> <Self as WithBitmapSlice<'_>>::S

Return a <Self as WithBitmapSlice>::S slice of the current bitmap, starting at the specified offset.
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impl BitmapReplace for BitmapMmapRegion

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type InnerBitmap = AtomicBitmapMmap

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fn replace(&self, bitmap: AtomicBitmapMmap)

Replace the internal Bitmap
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impl Clone for BitmapMmapRegion

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fn clone(&self) -> BitmapMmapRegion

Returns a duplicate of the value. Read more
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const fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for BitmapMmapRegion

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Default for BitmapMmapRegion

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fn default() -> BitmapMmapRegion

Returns the “default value” for a type. Read more
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impl NewBitmap for BitmapMmapRegion

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fn with_len(_len: usize) -> Self

Create a new object based on the specified length in bytes.
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impl WithBitmapSlice<'_> for BitmapMmapRegion

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type S = BitmapMmapRegion

Type of the bitmap slice.
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impl BitmapSlice for BitmapMmapRegion

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V